Steve, I've been scrolling for 10+ years and am still experimenting with blades.
For cutting these trout using two 1/2" maple boards (stacked = 1") I used:
1) #2 Olson FR440R .026 x .011 .... These for fins, inside tail, small cuts.
2) #2 Olson FR443 .029 x .012 .... for speckles, eyes and gills.
3) #3 Flying Dutchman Penquin Silver .031 x .013
Disclaimer: I would not necessarly use these blades for different patterns / different wood.
I know blades by width and thickness Smallest I use is .022 x .009, largest .044 x .0?? I generally know the size blade (ie: .026 x .011) I want to start with.
Depending on how it cuts, determines if I change.